Translate the `dict` Pydantic core schema type

[candleindark]

This is needed for the translation of https://github.com/dandi/dandi-schema/blob/416fbc242d20479b2ba0d45f89c1181fc1e7b2ac/dandischema/models.py#L1783-L1786

dandi conversion:

1. digest slot

original pydantic:

currently -- note:

target:

IMMEDIATE TODO -- figure out WHAT TO not how to instrument it